Let $(X,A)$ and $(Y,B)$ be NDR-pairs. Their product in the category of topological pairs
is also an NDR-pair.
Arne Strøm, Note on cofibrations, Math. Scand. 19 (1966) 11-14 (jstor:24490229, dml:165952, MR0211403)
Arne Strøm, Note on cofibrations II, Math. Scand. 22 (1968) 130–142 (1969) (jstor:24489730, dml:166037, MR0243525)
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